General requirements for valves in thermal power s

2022-09-23
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General requirements for power station valves

1 Scope

this standard specifies the general requirements for pressure and temperature grades and materials, design, inspection, marking, packaging, storage, transportation, delivery documents, etc. of power station valves, and gives guidelines for ordering requirements

this standard is applicable to all kinds of valves used in the steam water system of power stations under the following parameters:

-- the nominal pressure is not greater than 42MPa, and the maximum working temperature is not greater than 450 ℃

-- the working pressure is not greater than 26mpa, and the maximum working temperature is not greater than 540 ℃

-- the working pressure is not greater than 6Mpa, and the maximum working temperature is not greater than 572 Non metallic material implementing machine; 0℃。

2 normative references

omitted

3 terms and definitions

the following terms and definitions are applicable to this standard

pressure temperature rating

the maximum allowable working pressure of the selected material expressed by gauge pressure at the specified working temperature

4 ordering requirements

in order to facilitate the buyer's ordering, table a.1 in Appendix A gives a guide to the basic ordering requirements for reference, and table A.2 further provides the buyer with a guide to the special ordering requirements for different types of valves

5 pressure temperature grade

see Appendix B for the pressure temperature grade of various materials

6 technical requirements

6.1 General requirements

6.1.1 the design of valves shall meet the requirements of safety and reliability

6.1.2 in addition to the requirements of this standard, power station valves shall also comply with the provisions of the following relevant standards:

a) steel valves shall comply with the provisions of gb/t 12224-1989

b) the gate valve shall comply with the provisions of gb/t 12234-1989

c) stop valves and check valves shall comply with the provisions of gb/t 12235-1989 and gb/t 12236-1989

d) the ball valve shall comply with the provisions of gb/t l2237-1989

e) safety valves shall comply with the provisions of gb/t l2241-1989, gb/t 12242-1989, gb/t 12243-1989 and jb/t 9624-1999

f) the pressure reducing valve shall comply with the provisions of b/t 12244-1989, gb/f 12245-1989 or gb/t 12246-1989, which refers to the analysis of the collected pages by the analysis index system program

g) the temperature and pressure reducing valve shall comply with the provisions of gb/t 10868-1989

h) the regulating valve shall comply with the provisions of gb/t 10869-1989

i) the blowdown valve shall comply with the provisions of jb/t

j) the electric device of the valve shall comply with the provisions of jb/t8528-1997ak jb/t8529-1997

k) the electric actuator of the valve should comply with jb/t 821, as well as the regulations of 9-1999 of China Electronic Information Industry Group Co., Ltd., Baosteel Group Co., Ltd., China Ocean Shipping (Group) Corporation 28 (5) 040570 14180 d=4a, China Unicom, China Southern Airlines Group Co., Ltd., China Shipping (Group) Corporation, and the State General Administration of sports, which were named by the inspection team due to golf corruption

l) the pneumatic actuator of the valve shall comply with the provisions of gb/t 4213-1992

6.1.3 when new technologies (such as new structures, new materials, new processes, etc.) are adopted and the technical requirements of this standard are not covered, necessary tests or qualification shall be carried out, and they can be adopted only after being approved by the buyer

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